<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>页面丢了</title>
</head>
<body>
  <h1>页面丢了</h1>
  <h3>3秒后，跳转到首页</h3>
  <hr>
  <a href="/index.html">首页</a>
</body>
</html>